Sewing machine



B. BRYSON 2,364,515

SEWING MACHINE Original Filed Dec. 9, 1942 73 INVENTOR fiz W BY Ail ATTORNEYS Patented Dec. 5, 1944 SEWING MACHINE Boyd Bryson, Clifton, N. 5., assignor to Bryson Manufacturing'Co. Inc., Clifton, N. J a corporation of New Jersey Griginal application December 9, 1942, Serial No".v

468,334. Divided and this application October 12, 1943, Serial No. 505,916

6 Claims.

This invention relates to sewing machines and this application is a division of my co-pending application, Serial No. 468,334, filed December 9,

In the stitching of certain types of material in large scale production, electrically driven sewing machines operate for a considerable period of time without the attention of the operator. It

is not unusual for a single operator to have charge of a battery of some twelve to fifteen machines. It sometimes happens that the bob-bin thread breaks or runs out of a machine and if a machine continues to operate under such conditions, its productive ability is wasted. The operator cannot always be immediately aware of the failure of the bobbin thread due to the large number of machines serviced by a single operator.

' An object of this invention is the provision on sewing machines of this type of automatically operated meansfor stopping the sewing machine in the event of failure for any reason of the bobbin thread.

Other objects, novel features and advantages of this invention will become apparent from the following specification and accompanying drawing, wherein:

Fig. 1 is an end elevation of the needle supporting portion of a sewing machine with the bobbin thread functioning;

Fig. 2 is a view similar to Fig. 1 with the bobbin thread not functioning;

Fig. 3 is an enlarged fragmentary front elevation, and

Fig. 3 is a section on the line 44 of Fig. 3.

The.presser foot 32 has a needle hole from which a narrow slot 34 extends in the direction of travel of the goodsv A standard'tfi is attached to the sewing machine frame adjacent the presser foot 32 but a little to the right thereof. The standard 35 carries a sleeve 36 which slants upwardly in the direction of travel of the goods and receives a reciprocable bar 31. At its lower end, the bar 31 carries a pin 38 which overlies the presser foot 32 and is slightly offset from the needle path in the direction of the travel of the goods. One end of the pin 38 extends into a slot in a guide bar 39 having the same angularity as the bar 31. The presser foot supports a bar l which carries a contact Al to which is connected an electrical conductor 42. The lower end of the bar 31 engages a stop M to limit its downward and rightward movement. The stop 414 preferably is adjustable to permit re-arrangement of the lowermost position of the rod 31.

The machine is provided with a standard bobbin #3 which is operated in the well-known manner by means (not shown). The bobbin thread T cooperates with the needle thread T in the usual manner to produce the stitch. As long as there is no failure of the bobbin thread, the needle thread remains in a true vertical position to the right of the pin 38 without exerting any pull thereon, such condition being shown in Fig. 1. However, in the event of failure of the bobbin thread, the bottom end of the needle thread is carried along by the goods to the left as shown in Fig. 2 and enters the slot 34 thereby pulling the needle thread T around the pin to cause the bar to move upwardly in the sleeve 36 into engagement with the contact.

The conductor 42 is connected with one terminal of an electrical source and the bar 31 is connected to the remaining terminal of said source by the metal of the sewing machine. The wiring arrangement is such that when the rod 31 engages the contact 4|, the control circuit is closed which is effective to discontinue the supply of power to the machine, thereby causing the machine to come to. rest. Such arrangement is illustrated in Fig. l of the parent application for this application.

I claim:

1. In a sewing machine having electric drive means, a presser foot having a needle aperture and a slot leading therefrom in the direction of the goods travel, a bar reciprocable obliquely to th direction of the goods travel between two positions and being biased by its own weight toward one position, a stationary contact engageable by said bar in its other position, a pin carried by said bar and located adjacent the needle path, said pin being engageable by the needle thread upon movement of the latter into said slot, upon failure of the bobbin thread, to effect movement of said bar from said one position to said other position, and circuit means including said bar and contact for controlling said electric drive means.

2. In a sewing machine having electric drive means, a presser foot having a needle aperture and a slot leading therefrom in the direction of goods travel, a bar reciprocable obliquely to the direction of the goods travel between two positions and biased toward one position, a pin carried by said bar and located adjacent the needle path, said pin being engageable by the needle thread, upon failure of the bobbin thread, to eifect movement of said bar from said one position to the other, a stationary bar parallel to said reciprocable bar and having a slot receiving said pin, and means responsive to the movement of said reciprocable bar into said other position to de-energize said drive means.

3. In a, sewing machine having electric drive means, a presser foot having a, needle aperture and a slot leading therefrom in the direction of the goods travel, a bar reciprocable obliquely to the direction of the goods travel between two positions and being biased by its own weight toward one position, a stationary contact engageable by said bar in its other position, a pin carried by said bar and located adjacent the needle path, said pin being engageable by the needle thread upon movement of the latter into said slot, upon failure of the bobbin thread, to effect movement of said bar from said one position to said other position, a stationary bar parallel to said reciprocable bar, a slot in said stationary bar receiving said pin, and circuit means including said reciprocable bar and contact for controlling said electric drive means.

4. In a sewing machine, a presser foot having a needle aperture and a slot leading therefrom in the direction of the goods travel, a bar reciprocable obliquely to the direction of the goods travel between a first position and a second position and being biased by its own weight toward said first position, a stationary contact engageable by said bar in its second position, a pin carried by said bar and located adjacent the needle path, said pin being engageable by the needle thread upon movement of the latter into said slot, following failure of the bobbin thread, to effect movement of said bar from said first position to said second position.

5. In a, sewing machine, a presser foot having a needle aperture and a slot leading therefrom in the direction of goods travel, a, bar reciprocable obliquely to the direction of the goods travel between a. first position and a second position and biased toward said first position, a pin carried by said bar and located adjacent the needle path, said pin being engageable by the needle thread, upon failure of the bobbin thread, to eifect movement of said bar from said first position to said second position, a stationary bar parallel to said reciprocable bar and having a slot receiving said pin, and a stationary contact engageable by said reciprocable bar in its second position.

6. In a sewing machine, a presser foot having a needle aperture and a slot leading therefrom in the direction of goods travel, a bar reciprocable obliquely to the direction of goods travel between a first position and a second position and being biased by its own weight toward said first position, a stationary contact engageable by said bar in its second position, a pin carried by said bar and located adjacent the needle path, said pin being engageable by the needle thread upon movement of the latter into said slot, following failure of the bobbin thread, to effect movement of said bar from said first osition to said second position, a stationary bar parallel to said reciprocable bar, and a slot in said bar receiving said pin.

BOYD BRYSON. 

